LCM12232A LCM12232A. 122 x 32 1/32D STN( EL / 100VAC 400HZ LED / 4.2VDC

Transcription

1 LCM12232A 122 x 32 1/32D STN( ), EL LED EL / 100VAC 400HZ LED / 4.2VDC / 1

2 VDD-VSS V Ta=25 LCD VDD-V V V1 0 VDD V VDD-VSS V LCD VDD-V V IDD ma LCD IEE ma LCD V VDD-V V V H VIH 0.7VDD - VDD V L VIIL 0-0.3VDD V 1 VDD 5.0V 2 VSS 0V GND 3 V0 LCD 4 RES H/L 5 EI H,H L 1 6 E2 H,H L 2 7 R/W H/L H: L: 8 A0 H/L H: L: 9 D0 H/L 0 10 D1 H/L 1 11 D2 H/L 2 12 D3 H/L 3 13 D4 H/L 4 14 D5 H/L 5 15 D6 H/L 6 16 D7 H/L 7 2

3 AC Characteristics Read/Write timing for the 80-port MPU (Ta = 20 to 75 C, VSS = 5.0V±10%) Parameter Signal Symbol Condition Rating Unit Min Type Max Address hold time tahb ns Address set-up time A0, CS tawb ns System cycle time tcyc ns Control pulse width WR, RD tcc ns Data set-up time tds ns Data hold time D0 ~ D7 tdh ns RD access time tacc8 CL = 100pF ns Output disable time toh ns *. The ratings when VSS = 3.0V are approximately 100% higher than when VSS = 5.0V. Read/Write timing for the 68-port MPU (Ta = 20 to 75 C, VSS = 5.0V±10%) Parameter Signal Symbol Condition Rating Unit Min Type Max System cycle time tcyc6 * ns Address set-up time A0, CS taw ns Address hold time R/W tah ns Data set-up time tds ns Data hold time D0-D7 tdh ns Output disable time toh6 CL = 100pF ns Access time tacc ns Enable pulse READ E tew ns width WRITE ns *. tcyc6 indicates the cycle during which CS/E are HIGH; it does not indicate the cycle of the E signal. *. The ratings when VSS = 3.0V are approximately 100% higher than when VSS = 5.0V. Control timing for 80-port/68-port display (Ta = 20 to 75 C, VSS = 5.0V±10%) Parameter Signal Symbol Condition Rating Unit Min Type Max LOW pulse width twlcl µs HIGH pulse width CL twhcl µs Rising time tr ns Falling time tf ns FR delay time FR tdfr (Input timing) µs (Output timing), CL = 100pF *. The ratings when VSS = 3.0V are approximately 100% higher than when VSS = 5.0V. *. The input timing of the FR delay time is determined by the SED1520 (Slave). The output timing of the FR delay time is determined by the SED1520 (Master). 3

4 Timing Chart Read/Write timing for the 80-port MPU Read/Write timing for the 68-port MPU Control timing for 80-port/68-port display 4

5 MODEL CLASSIFICATION Model Name Operating Clock Connectable Drivers SEG COM Internal oscillator External clock Driver driver SED1520FO* 18 KHz 18 khz SED1520FO*,SED1521FO* 61 ports 16 ports SED1520FA* - 2 KHz SED1520FA*, SED1521FA* 61 ports 16 ports DISPLAY COMMANDS (Based on the 80-port MPU; the RD and WR commands differ for the 68-port MPU.) Command RD WR A0 D7 D6 D5 D4 D3 D2 D1 D0 Function 1 Display ON/OFF /1 Switches the entire display ON or OFF, regardless of the 2 Display START Line Display START address (0~31) 3 Page Address Set Page (0~3) 4 Column (Segment) Column address Address Set (0~79) Status Read BUSY ACC ON/OFF RESET Write Display Data Write Data Writes the data on the data bus to RAM Read Display Data ADC Select Read Data /1 Static Drive ON/OFF /1 Display RAM s data or the internal status. ** Determines the line of RAM data to be displayed at the display s top line (COM0). Sets the page of the Display RAM in the page address register. Sets the column address of the Display RAM in the column address register. Reads the status. BUSY 1: Busy (internal processing) 0: READY status ADC 1: Rightward (forward) output 0: Leftward (reverse) output ON/OFF 1: Display OFF 0: Display ON RESET 1: Resetting 0: Normal These commands access a previously-specified Reads data from the Display address of the Display RAM onto the data bus. RAM, after which the column address is incremented by one. Used to reverse the correspondence between the Display RAM s column addresses and segment driver output ports 0: Rightward (forward) output 1: Leftward (reverse) output Selects normal display operation or static all-lit drive display operation. 1: Static drive (Power Save) **7 0: Normal display operation 10 Duty Select /1 Selects the duty factor for driving LCD cells. 1: 1/32 duty 0: 1/16 duty 11 Read Modify Write Increments the column address counter by one only when display data is written but not when it is read. 12 End Cancels the Ready Modify Write mode. Reset Resets the Display START line to the 1st line in the register. Resets the column address counter to 0 and page address register to 3. **. Power Save mode is entered by selecting static drive in Display OFF status. 5

6 ;LCM12232A PINS DEFINE: 1Vss 2Vdd 3VO(Vee) 4RES 5E1 ; 6E2 7R/W 8A0 9DB0 10DB1 11DB2 12DB3 13DB4 14DB5 15DB6 ; 16DB7 (SED1520D0A X 2) ;POWER SUPPLY power 3V-5V, Vlcd = 5.75V ; a0: EQU P3.0 e1: EQU p3.1 e2: EQU p3.2 rw: EQU p3.3 ; org 0000h ljmp main org 000bh clr tf0 ljmp main org 0100h main: clr rw mov tmod,01h ;intialize timer watchdog. 6

7 setb tr0 ;open cpu interuppert. setb et0 setb ea mov 22h,#0ffh lcall begin mov tl0,#00h mov th0,#00h mov tl0,#00h mov th0,#00h mov 22h,#55h lcall begin mov tl0,#00h mov th0,#00h mov 22h,#0aah lcall begin mov tl0,#00h mov th0,#00h ; display " " mov 21h,#04h ;pages register mov 20h,#0b8h ;first page pg: mov r0,20h ;set page (PAGES RANGE:B8H-BBH) mov r0,#0c0h ;set display start line mov r0,#00h ;set start column address mov b,#4fh ;modify setb a0 disp1: mov r0,#0ffh 7

8 pg2: mov r0,#00h djnz b,disp1 inc 20h djnz 21h,pg ;=====================================display " " mov 21h,#04h ;pages register mov 20h,#0b8h ;first page mov r0,20h ;set page (PAGES RANGE:B8H-BBH) mov r0,#0c0h ;set display start line mov r0,#00h mov b,#4fh setb a0 disp2: mov r0,#00h mov r0,#ffh djnz b,disp2 inc 20h djnz 21h,pg2 ;set start column address ;========================================display "2" mov 21h,#04h ;pages register 8

9 mov 20h,#0b8h ;first page pg3: mov r0,20h ;set page (PAGES RANGE:B8H-BBH) mov r0,#c0h ;set display start line mov r0,#00h ;set start column address mov b,#06h mov r2,#0ah setb a0 nword: mov dptr,#tab disp3: clr a movc a,@a+dptr mov r0,a inc dptr djnz b,disp3 mov b,#06h djnz r2,nword inc 20h djnz 21h,pg3 setb p3.4 here: ajmp main ; begin: ;select command register mov r0,#0afh ;display on mov 20h,#0b8h ;set initial page mov 21h,#04h ;pages register npage: mov r0,20h ;set page (PAGES RANGE:B8H-BBH) 9

10 mov r0,#0c0h ;set display start line mov r0,#00h ;set start column address setb a0 ;select data register mov a,22h mov r0,22h;display data mov b,#4fh; dis: djnz b,dis inc 20h djnz 21h,npage ret ; write: ;write data or command to SED1520. mov p1,#00h setb e1 setb e2 mov a,r0 mov p1,a lcall delay clr e1 ;the display data in Master is displaying clr e2 ;the display data in Slave is displaying setb a0 ret ; wait: mov r4,#05h dl1: mov r5,#0ffh dl2: mov r6,#0ffh dl3: djnz r6,dl3 dl4: djnz r5,dl2 djnz r4,dl1 ret delay: ret tab: DB 00h,42h,61h,51h,49h,46h END 10